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Two Colour CCD Photometry of Malin–Carter Shell Galaxies
1987
Symposium - International astronomical union
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Shells may be the result of the disruption of a small companion in the potential of a much larger galaxy (e.g., Hernquist & Quinn, 1986; Dupraz & Combes, 1985), the disturbance of a disk system in a tidal encounter (Toomre, 1972), an accumulation of resonant stellar orbits (Binney, pers.comm.) or the result of some shock phenomenon in a hot galactic atmosphere (e.g., Williams & Christiansen, 1985; Wilkinson & Bailey, 1985;). To distinguish between these formation mechanisms, CCD direct images
doi:10.1017/s0074180900185766
fatcat:az67x3talzeepo33lhw7yxscau